It is generally believed that Mahan was founded before the 2nd century BC. According to historical records, Mahan began with King Jun's migration and settlement in the Iksan area. Since there are not many cases that have been investigated in relation to the residential areas with living remains, few facts of them are known accurately. The tombs constructed include wooden coffin tombs with stone mound, pit tombs, and jar coffin tombs. Out of them, however, wooden coffin tombs with stone mound and pit tombs from an early period are sporadically identified, and the mainly excavated relics are bronze ware. Following the southward transfer of King Jun, a large group of tombs were constructed as in Madong, and the relics excavated are featuring both bronze and iron ware. In light of this, it can be said that the Mahan society in the Iksan region during the establishment period developed by actively accepting advanced civilization. Around the 1st century, the Mahan society in the Iksan region faced a period of stagnation, and villages began to be built in full swing after the 2nd century AD, reaching a peak in the 3rd to 4th centuries AD. Large-scale settlements appeared in places like Sadeok and Jangshin and small- and medium-sized villages were formed and organically connected to each other around the large-scale settlements in the center. As for tombs, mounded tombs with an encircling ditch began to be built in earnest, and it can be seen as the developing period of Mahan culture.. The Mahan culture in the Iksan area sustained even after Baekje territorialization. Such dwellings as four-pillar and non-four-pillar types of Mahan culture continued and, in some dwellings, fire pits made of plate stone and utensils which can be seen as Baekje elements appear and Baekje pottery is found in the sites of dwellings. Furthermore, dwelling sites with pillars used for walls related to the center of Baekje made an entrance. Tombs of the Mahan tradition also continued to be built even after Baekje territorialization. However, the stone chamber or stone-lined tomb related to the center of Baekje were employed for burial body and the grave goods changed to Baekje pottery, while Baekje pottery was excavated within the burial mound. In the areas of Ipjeom-ri and Ungpo-ri, the lower reaches of the Geumgang River, stone- built tombs of Baekje style were built in the mid-5th century, an evidence confirming that Baekje first took control of the lower Geumgang River, an important waterway transportation route and gateway. After the Gwangam-ri area in the middle of the Mangyeong River basin first became Baekje territory, Baekje central culture seemed to have entered the surrounding areas, too.